refactor: share one conflict-gate dispatch across the three sync commands

The description, title, and comment syncs each carried the same :noop / :conflict / :push dispatch — only the hash property, the local-text source, the fetch and push functions, the apply step, and the status messages differed. I pulled the dispatch into pearl--commit-sync-decision, which takes a spec plist for the varying parts (description alone advances LINEAR-DESC-UPDATED-AT, via :after-push). The three commands now build a spec and call it, and the comment's own-comment permission check stays in its caller. No behavior change — 353 tests green, including the sync, title-sync, comment-editing, and conflict suites.

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